If $\begin{bmatrix$}[r] 2 & 0 \ 0 & 4 \end{bmatrix}\begin{bmatrix}[r] x \ y \end{bmatrix} = \begin{bmatrix}[r] 2 \ -8 \end{bmatrix}, the values of x and y respectively are :

1. 1, -2

2. -2, 1

3. 1, 2

4. -2, -1

If x - 2 is a factor of x³ - kx - 12, then the value of k is :

1. 3

2. 2

3. -2

4. -3

A letter is chosen at random from all the letters of the English alphabets. The probability that the letter chosen is a vowel, is :

1. $\dfrac{4}{26}$

2. $\dfrac{5}{26}$

3. $\dfrac{21}{26}$

4. $\dfrac{5}{24}$

If 3 is a root of the quadratic equation x² - px + 3 = 0 then p is equal to :

1. 4

2. 3

3. 5

4. 2